.. _urls:

JupyterLab URLs
---------------

Like the classic notebook, JupyterLab provides a way for users to copy URLs that
open a specific notebook or file. Additionally, JupyterLab URLs are an advanced
part of the user interface that allows for managing workspaces. These two
functions -- file paths and workspaces -- can be :ref:`combined in URLs that open a
specific file in a specific workspace <url-combine>`.

.. _url-tree:

File Navigation with ``/tree``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

JupyterLab's file navigation URLs adopts
the nomenclature of the classic notebook; these URLs are ``/tree`` URLs:

.. code-block:: none

  http(s)://<server:port>/<lab-location>/lab/tree/path/to/notebook.ipynb

Entering this URL will open the notebook in JupyterLab in
:ref:`single-document mode <tabs>`.


.. _url-workspaces-ui:

Managing Workspaces (UI)
~~~~~~~~~~~~~~~~~~~~~~~~

JupyterLab sessions always reside in a workspace. Workspaces contain the state
of JupyterLab: the files that are currently open, the layout of the application
areas and tabs, etc. When the page is refreshed, the workspace is restored.

The default workspace does not have a name and resides at the primary ``/lab``
URL:

.. code-block:: none

  http(s)://<server:port>/<lab-location>/lab

All other workspaces have a name that is part of the URL:

.. code-block:: none

  http(s)://<server:port>/<lab-location>/lab/workspaces/foo

Workspaces save their state on the server and can be shared between
multiple users (or browsers) as long as they have access to the same server.

A workspace should only be open in a single browser tab at a time. If JupyterLab
detects that a workspace is being opened multiple times simultaneously, it will
prompt for a new workspace name. Opening a document in two different browser
tabs simultaneously is also not supported.

.. _url-clone:

Cloning Workspaces
~~~~~~~~~~~~~~~~~~

You can copy the contents of a workspace into another workspace with the ``clone`` url parameter.

To copy the contents of the workspace ``foo`` into the workspace ``bar``:

.. code-block:: none

  http(s)://<server:port>/<lab-location>/lab/workspaces/bar?clone=foo

To copy the contents of the default workspace into the workspace ``foo``:

.. code-block:: none

  http(s)://<server:port>/<lab-location>/lab/workspaces/foo?clone

To copy the contents of the workspace ``foo`` into the default workspace:

.. code-block:: none

  http(s)://<server:port>/<lab-location>/lab?clone=foo

.. _url-reset:

Resetting a Workspace
~~~~~~~~~~~~~~~~~~~~~

Use the ``reset`` url parameter to clear a workspace of its contents.

To reset the contents of the workspace ``foo``:

.. code-block:: none

  http(s)://<server:port>/<lab-location>/lab/workspaces/foo?reset

To reset the contents of the default workspace:

.. code-block:: none

  http(s)://<server:port>/<lab-location>/lab/workspaces/lab?reset

.. _url-combine:

Combining URL Functions
~~~~~~~~~~~~~~~~~~~~~~~

These URL functions can be used separately, as above, or in combination.

To reset the workspace ``foo`` and load a specific notebook afterward:

.. code-block:: none

  http(s)://<server:port>/<lab-location>/lab/workspaces/foo/tree/path/to/notebook.ipynb?reset

To clone the contents of the workspace ``bar`` into the workspace ``foo`` and
load a notebook afterward:

.. code-block:: none

  http(s)://<server:port>/<lab-location>/lab/workspaces/foo/tree/path/to/notebook.ipynb?clone=bar

To reset the contents of the default workspace and load a notebook:

.. code-block:: none

  http(s)://<server:port>/<lab-location>/lab/tree/path/to/notebook.ipynb?reset

.. _url-workspaces-cli:

Managing Workspaces (CLI)
~~~~~~~~~~~~~~~~~~~~~~~~~

JupyterLab provides a command-line interface for workspace ``import`` and
``export``:

.. code-block:: bash

  $ # Exports the default JupyterLab workspace
  $ jupyter lab workspaces export
  {"data": {}, "metadata": {"id": "/lab"}}
  $
  $ # Exports the workspaces named `foo`
  $ jupyter lab workspaces export foo
  {"data": {}, "metadata": {"id": "/lab/workspaces/foo"}}
  $
  $ # Exports the workspace named `foo` into a file called `file_name.json`
  $ jupyter lab workspaces export foo > file_name.json
  $
  $ # Imports the workspace file `file_name.json`.
  $ jupyter lab workspaces import file_name.json
  Saved workspace: <workspaces-directory>/labworkspacesfoo-54d5.jupyterlab-workspace

The ``export`` functionality is as friendly as possible: if a workspace does not
exist, it will still generate an empty workspace for export.

The ``import`` functionality validates the structure of the workspace file and
validates the ``id`` field in the workspace ``metadata`` to make sure its URL is
compatible with either the ``workspaces_url`` configuration or the ``page_url``
configuration to verify that it is a correctly named workspace or it is the
default workspace.
